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^9Be + ^(12)C, ^9Be + ^(16)O,^9Be + ^(19)F reactions at energies below the barrier

Switkowski, Z. E. and Shiu-Chin, Wu and Overley, J. C. and Barnes, C. A. (1977) ^9Be + ^(12)C, ^9Be + ^(16)O,^9Be + ^(19)F reactions at energies below the barrier. Nuclear Physics A, 289 (1). pp. 236-252. ISSN 0375-9474. doi:10.1016/0375-9474(77)90531-0.

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The ^(16)O + ^9Be reactions have been studied from E_(c.m.) = 2.0 MeV to 5.1 MeV, an energy near the top of the Coulomb barrier. The cross section for the neutron transfer reaction ^9Be(^(16)O,^(17)O^∗ (0.87 MeV))^8Be has been measured over this range by detecting the prompt 0.87 MeV γ-rays. The total fusion cross section has been determined from E_(c.m.) = 2.8 to 5.1 MeV by observing individual γ-ray transitions in the evaporation residues with a Ge(Li) detector, and then summing the separate yields. Direct processes are found to dominate the reaction yield below E_(c.m.) = 4 MeV. A comparison of the energy dependence of the fusion cross section for this reaction and the ^(12)C + ^(13)C reaction, which proceeds via the formation of the same compound nucleus, ^(25)Mg, reveals differences at sub-barrier energies. Optical model and incoming-wave boundary condition calculations are presented. Data have also been obtained for the near optimum Q-value neutron-transfer reactions ^9Be(^(12)C, ^(13)C^∗)^8Be and ^9Be(^(19)F, ^(20)F)^8Be, and these are discussed in terms of a simple model of sub-barrier direct reactions.

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Additional Information:© 1977 North-Holland Publishing Co. Received 22 November 1976, Revised 6 June 1977. Supported in part by the National Science Foundation [PHY76-83685]. We would like to thank Professors A. Winther and T. A. Tombrello and Dr. R. G. Stokstad for interesting and helpful discussions of this work.
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Subject Keywords:Nuclear Reactions
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Official Citation:Z.E. Switkowski, Wu Shiu-Chin, J.C. Overley, C.A. Barnes, 9Be + 12C, 9Be + 16O,9Be + 19F reactions at energies below the barrier, Nuclear Physics A, Volume 289, Issue 1, 10 October 1977, Pages 236-252, ISSN 0375-9474, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:60139
Deposited By: Ruth Sustaita
Deposited On:11 Sep 2015 14:59
Last Modified:10 Nov 2021 22:30

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